...

  tuple->Branch("EVT_ID",&EVT_ID);
  tuple->Branch("B_TRUETAU",&B_TRUETAU);
  tuple->Branch("B_TRUEM",&B_TRUEM);
  tuple->Branch("B_TRUEID",&B_TRUEID);
  tuple->Branch("B_MIXED",&B_MIXED);
  tuple->Branch("B_NDAUG",&B_NDAUG);

  ...

  for (int i = 0; i < nEvents; i++) {

    ...

    // ================
    // == USER TUPLE ==
    // ================

    EVT_ID = i;

    B_TRUETAU = parent->getLifetime()/EvtConst::c*1E12;

    B_TRUEM = parent->mass();

    EvtPDL *evtpdl;
    B_TRUEID = evtpdl->getStdHep( parent->getId() );

    int id = evtpdl->getStdHep( parent->getDaug(0)->getId() );
    (id == 531 || id == -531) ? B_MIXED = 1 : B_MIXED = 0;

    B_NDAUG = parent->getNDaug();
   
    tuple->Fill();

    ...
}